Reenforced plaster board



Sept. 25, 1928. 1,685,254

c. o. WALPER REENFORCED PLASTER BOARD Filed MaICh 15, 1926 Patented Sept. 25, 1928.

UNITED" STATES PATENT OFFICE.

CURRY O. WALPER, OF DETROIT, MICHIGAN, ASSIGE'OR TO STANDARD PLASTERING v SYSTEM, INC., OF DETROIT, MICHIGAN,-A CORPORATION OF MICHIGAN.

- REENFORGED PLASTER BOARD.

' Application filed March 15, 1926. Serial No. 94,797.

4 This invention relates to plaster and similar composition boards and their use in building construction wherein it is desirable as a measure of fire protection and for reasons of strength and stability to provide reenforcement which will assist in the retaining of the board intact under conditions which might otherwise result in the breaking down of parts comprising a wall or ceiling structure. This breaking down is more prevalent where the supporting nails of the boards are not prevented from passing through the boards under conditions of extreme moisture or other conditions often responsible for such an effect, or the heads of the nails not adequately protected against heat, and it is an object of this invention to provide for the incorporation of means in such boards which will substantially reenforce the board as a whole and provide a very effective means of reenforcing the points through which the nails may be passed, whilst limiting the extent to which the heads of such nails may penetrate the boards, and permitting the penetration into' the boards to such limited extent.

A further object of the invention is to pro-' ric having a mesh smaller than that of the heads of the nails which are intended to be used with the .wall board, so that the heads of such nails may not pass through such fabric and so/t-hat the mesh of the fabric may closely surround the shanks of the nails and so assist in the secure positioning of such nails 7 in the board.

A still further object is to provide for the positive location of the plane of wire fabric within the board approximately equi-distant from opposite sides thereof thereby overcoming tendencies of the board to warp in manufacture such, as would be usually present where the fabric is not centrally disposed within the board.

The invention still further contemplates the provision'of such wire fabric with means whereby it effects its self-positioning within the ,board in the course of its incorporation therein during manufacture of the board.

- Still further objects subsidiary to or resulting from the aforesaid objects or from the construction and operation of the invention as it may be carried into effect will become apparent as the said invention is hereinafter further disclosed.

In carrying the said invention into effect I may provide a plaster board having fiber, paper, or other surfaces with a wire reenforcement embedded in the plaster core equiadistantly from said surfaces, said wire reenforcement being characterized by its having a substantially small. mesh approximating in its spacing the diameter of the shanks of the nails intended to be used with such boards and smaller than the heads of such nails, and I prefer to provide such wire reenforcement with depressed portions forming projections on opposite sides of the wire fabric of a height approximating half of the thickness of the core so that the combined height of theprosimilar surfaces of the board and space such surface equi-dist-antly from the general plane of the wire fabric. c All of which is more particularly described and ascertained hereinafter, by way ofexample, having reference to the accompanying drawing, wherein- Figure 1 is a fragmentary perspective view of a plaster board embodying the said invention, certain of the layers of the board being partially broken away to indicate its construction;

Figure 2 is a fragmentary section of a wall indicating the application of my improved parts thereto Figure 3 is a fragmentary elevation of such a wall, part of the surface of the board being broken away to indicate the internal construction;

Figure 4 is a, horizontal section taken on the line i -4% Figure 3;

Figure 5 is a fragmentary transverse seetiono'f a wall board illustrating the modified form of invention Figure 6 is a fragmentary plan of the same with part of the surface broken away to indicate the internal construction, and v v Figure 7 is a fragmentary {perspective view" illustrating a further modi ed form of the invention.

Similar characters of reference indicate similar parts in the several figures of the drawing, Figure 3 being drawn to. a larger scale than Figures 1, 2, 5 and 6, and Figure 4 drawn to a still larger scale.

The plaster board in this instance is indicated ascomprisinga boardhaving a plaster core 1 and fibrous or paper faces 2 and 3 which is a. well known construction, and to accomplish the purposes of this invention ,I simply embed in the core 1 a sheet of wire fabric 4 of small mesh, and I attach considerable importance to the size of the mesh as entering into the supporting of the board in use in the manner hereinafter more particularly referred to. v

It should be understood that it has been hitherto proposed to reenforce a plaster board by embedding a wire or other fabrication in the core thereof with the sole object of adding strength to the board, and

without the features resulting in or anticiv pating the co-operation of the embedded fabric with the securing nails of the board as effected by the present invention.

An examination of Figures 2 .and 3.will reveal that the meshes of the fabric 4 are smaller than the heads 5 of the nails, the shanks 6 of which pass through the meshes of the said wire fabric when the boards are nailed in position as to studding 7, it being proposed to drive the nails until the heads thereof penetrate the outer surface of the boards and come into contact with the embedded wire fabric, the said heads of the nails when so driven forming recesses 8 which become filled with plaster upon the application of a finishing coat of plaster 9. It is preferred to cover the nailed portions of the boards wit-h a strip of woven wire or other fabric 10 through which the plaster is extrudedinto the said recesses 8.'

1 w'ardly on the opposite side of the said fabric, these projections engaging the paper or fiber faces? and 3 respectively of the board and retaining the plane of the fabric central of the core 1.

Figure 4 indicates that the fabric may be driven by the nail towards studding 7 whereby pressure of the said fabric is exerted to wards the said studding over considerable area and a Very firm securing of the plaster board to the studding thereby obtained.

It will be obvious that but for the engagement of the heads of the nails with the embedded wire fabric a weakness would develop upon the forcing of the-heads of the nails into the body of the plaster boards, due

to the rcduc'ingof the thickness of plaster board between the head of the nail and the studding, but in the present case a firmer security is effected and at the same time the said heads are recessed into the boards in a manner admitting of the plaster coating over scribed.

In the modified form shown in Figure 7, a very convenient form of fabric 14 is shown in which the projections are in the form of ribs 15 formed as by a bending or folding of the fabric transversely or longitudinally, this form lending itself well to the peculiarities attending the incorporation of such a fabric in a composition board, and also tending to resist bendingor warping of the board in the direction of the length of such ribs.

This invention may be developed within the scope of the following claims Without departing from the essential features of the said invention, and it is desired that the specification anddrawing be read as merely illustrative and not in a limiting sense, except as necessitated by the prior art.

What I claim is 1. In a building construction, a plaster board having a wire fabric embedded therein and coextensive therewith, a support, fastening elements driven through the board 1 into said support and the heads of which contact with and are obstructed by said wire fabric, thereby leaving recesses in the board, and plaster applied to the outer surface of the board and filling said recesses.

2. In a building construction, a plaster board having a wire fabric embedded therein and coextensive therewith, a support, fastening elements driven through the board into said support in contact with and obstructed by said wire fabric, said element having fabric engaging means, thereby leaving recesses in the board, fabric applied over said recesses, and plaster applied to the outer surface of the board and forced through the last named fabric to fill'said recesses.

In testimony whereof I affix my signature.

CURRY W L ER' 

